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It is important to double-check, or recheck, the text (or images) before posting remarks. In perhaps 20% of cases, the actual data is not as imagined, due to illusions or delays in the displayed results. The crucial question to ask is: "Are you absolutely sure?"
Because of the numerous details in text formatting, in many cases, working with Wikipedia pages is similar to the detailed work of developing computer software source code, so there are many tiny details which can be overlooked, or mistaken, when trying to spot problems or errors. Always recheck the results, such as scanning through the text a second time, or run another edit-preview of a page to "Show preview" of the results, before clicking "Save page".
When displaying a Wikipedia page, the current page contents might not be rendered, yet, on the screen, due to browser caching which displays an older version of the page contents. It is always important to re-display a page with URL option "&action=purge" to completely re-generate the webpage, when it seems that current text has not appeared yet.